Means to keep mechanical driving mechanisms at alpha constant rate of rotation



ug 5, 1930- G. voN ARCO 1,772,373

I MEANS TO KEEP MECHANICAL DRIVING MECHANISMS AT A CONSTANT RATE OFROTATION Filed April 9, 1927 Patented Aug. 5, 1930 UNITED STATES PATENT`ori-ICE GEORG VON ARCO, OF BERLIN, GERMANY, ASSIGNOR TO GESELLSCHAFT FRDRAHTLOSE TELEGRAPHIE M. B. H., F BERLIN, GERMANY, A CORPORATION OFGERMANY MEANS TO KEEP MECHANICAL DRIVING MECHANISMS AT A CONSTANT RATE0F ROTATION Application. led April 9, 1927, Serial No.

It has previously been suggested to keep the running of clocks andsimilar mechani- :cal driving means constant by using a device.

. insuring constancy of rotation of the clockwork. But these deviceshave failed of attaining practical importance because they comprisedelectric circuit breakers, at one or more points, of very small motionampli- Itudes so that extremely exact adjustment was necessary, which,however, could not be maintained for any length of time on account ofwear of the contacts. K

The object of this invention is to devise means for obtaining constantspeed from ordinary driving devices.

Another object of this invention is to keep different driving mechanismsin step.

A further object of the invention is to keep a driving motor in stepwith an oscillatory circuit.

A still further object of the invention is 1 to obviate electricalcontact devices in constant speed apparatus.

Further objects of the invention will be `apparent from the followingspecification and drawings in which:

The single figure represents schematically an embodiment of theinvention.

. manner.

Cour wheel with a constant field in addition- 182,516, aaa in GermanyApril 1926.

to the oscillatory field so that in reality the wheel 4 would beaffected by a pulsating constant field.

As is evident from the drawing the mechanical driving mechanism is sogeared, that with the La Cour wheel coupled therewith mechanically, andwithout outside assistance the two will run in rather close synchronismwith the generated alternating current of the thermionic oscillator. Themechanical power therefore can be said to consist of two parts, in themain of the mechanical energy source l and in a minor degree of theelectrical source 1 -5. Thus if the mechanical source should show atendence to speed up for any reason this is prevented from occuring bythe electric brake. When however the mechanical driving mechanism tendsto slow up the electrical` end will supply a supplementary torquesufficient to boost the speed of the motor to the required level.

Of course any suitable utilizing device could be connected up with themotor shaft in any well known manner.

It is thus evident that by means of this invention a very simple andhighly ehicient speed control means may be had for comparatively smalldriving means.

Having thus described my inventi0n,what I claim as new and desire toprotect by Letters Patent is:

l. In a constant speed device, a driving mechanism, a synchronous motordevice having a fine toothed wheel, step-up mechanism for connectingsaid driving mechanism to said fine toothed wheel, a local thermionicoscillation generator adapted to generate oscillationkof a constantfrequency and means controlled thereby and acting on said fine toothedwheel for maintaining the speed of said driving mechanism constant.

2. In a constant speed device a driving unit, an auxiliary unitmechanically coupled thereto, both of -s aid 'units being coupled to adriven element, said auxiliary unit being adapted to rotate a greaterniliiiber of times per unit of time than saijd driving unit, a constantfrequency thermionic oscillation generator and means controlled by'theenergy generated therein and acting on said GEORG VON ARCO.

